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TrendingJ. Lo crushes it at 'Watch it Once' TikTok challenge

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Watch It Once TikTok Challenge with Jennifer Lopez

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It’s going DOWN tonight on @fallontonight!!! @JLo VS @jimmyfallon. Who do you think is gonna win?! #BTS #WorldOfDanceAgain https://t.co/uyRLd7JZTa

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.@JLo was honored to receive a compliment from @BarbraStreisand for her cover of “People” #FallonAtHom https://t.co/r7F03vjWJj

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.@charlidamelio was able to meet her idol @JLo before Jennifer’s #SuperBowlLIV halftime performance https://t.co/LK4XmW3uit #FallonAtHome https://t.co/1qhwHpee84

Jennifer Lopez took on Jimmy Fallon in a 'Watch-It-Once' TikTok Challenge on the 'Tonight Show.' Their last dance was a routine she choreographed to promote her new series 'World of Dance.' Unsurprisingly, she won.